Resistivity of the human body or tissue

[kender]

resisitivity human body frequence

Colleagues,

I’m trying to estimate the skin depth of the human body at 13.5MHz (one of the RFID frequencies). To do this I need to know the resistivity of the body or the tissue. I couldn’t find this number on the web. Does anyone know this number? The closest thing I could was resistivity of the seawater, which is 0.2 Ohm-meters. Is the resistivity of the human tissue much different from that of the seawater? Is it frequency-dependednt?

Cheers,
Nick

 

[ShuklaS]

human body conductivity

Hi,
I Dont have the exact value but the body conductivity vary with blod circulation
regards

 

[kender]

different tissues in the human body +salinity

I just realized that the medical saline has 0.9% salt and seawater has 3.5% salt. That could make a big difference in conductivity. The temperature difference between the normal conditions (25C) and the body temperature (37C) can make a big difference in conductivity too. Does anyone know of a table or a formula or a program that allows to find the conductivity of a salt solution of a given concentration at a given temperature?

Cheers,
Nick

 

[IanP]

Try this converter:

"Water Quality Monitoring: Conductivity to Salinity Conversion"
https://www.fivecreeks.org/monitor/sal.html

or if you prefer to do calculations by yourself, use formulas from:
**broken link removed**

Regards,
IanP

 

[kender]

Try this converter:
"Water Quality Monitoring: Conductivity to Salinity Conversion"
https://www.fivecreeks.org/monitor/sal.html

No worky. I need the other way around: salinity to conductivity.

or if you prefer to do calculations by yourself, use formulas from:
**broken link removed**

Thanks for the formulae!

 

[ricy]

Hi Kender

of course: the dielectric properties of human tissue are depending on the frequency!
Take a look here: **broken link removed**
You can type in your frequency (13.5 MHz?) and get the values for different types of human tissue; e.g. skin dry: sigma=0.237/eps=286.3

hope this helps
best: Ricy

 

[JAMSUL]

But how to calculate the total complex value of the skin for example, Epslon and sigma how to add them to get the total dielectric value or the real value i mean.

Regards

Hi Kender

of course: the dielectric properties of human tissue are depending on the frequency!
Take a look here: **broken link removed**
You can type in your frequency (13.5 MHz?) and get the values for different types of human tissue; e.g. skin dry: sigma=0.237/eps=286.3

hope this helps
best: Ricy

 

[js]

what are dielectric properties at low frequencys?